123200720065 has 4 divisors (see below), whose sum is σ = 147840864084. Its totient is φ = 98560576048.

The previous prime is 123200720063. The next prime is 123200720089. The reversal of 123200720065 is 560027002321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23025938049 + 100174782016 = 151743^2 + 316504^2 .

It is a cyclic number.

It is not a de Polignac number, because 123200720065 - 2¹ = 123200720063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123200720063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12320072002 + ... + 12320072011.

It is an arithmetic number, because the mean of its divisors is an integer number (36960216021).

Almost surely, 2^123200720065 is an apocalyptic number.

It is an amenable number.

123200720065 is a deficient number, since it is larger than the sum of its proper divisors (24640144019).

123200720065 is an equidigital number, since it uses as much as digits as its factorization.

123200720065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24640144018.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 123200720065 its reverse (560027002321), we get a palindrome (683227722386).

The spelling of 123200720065 in words is "one hundred twenty-three billion, two hundred million, seven hundred twenty thousand, sixty-five".